I recently participated in Channel 9 News - Gardenline 9.
Had a great time but had 3 callers asking about Rhubarb, specifically the flowering of the Rhubarb.
Yes, it is flowering too early because of our wacky weird, unseasonal Colorado weather.
It is best to cut off the flower spike at the base so that the flower does not use energy that should be going in to the leaves and stems.
Harvest is typically starts in May but may not be until mid June if the Sun continues to hide.
For More Information:
Plant Talk Colorado http://www.ext.colostate.edu/ptlk/1806.html